Anyone interested in getting a binaural beat program could try www.bwgen.com, the free version is limited and the full version is expensive but i use it fairly often to try and initiate lucid dreams or study (Study Aid has helped from time to time).

For those who dont know what it is.

Basically its not so much music so much as a series of beats, what happens is with headphones (need to use headphones) one pitch is played in one ear and one in the other the brain then hears the difference, this is useful as this allows us to hear beats that we normally cant hear (its not so much hearing so much as the cereberal cortex interpreting it), we can then use these to induce differing states of mind (Alpha, Beta, Gamma, Delta, Theta) for example if you wanted to hear say 4htz you would play 500htz in one ear and 496htz in the other.

For me i like the Theta state, best one for Lucid Dreaming, and they have found that for some people, 30 mintues of the Theta state is equivalent to 4 hours of regular sleep.